Inclusive photon production at forward rapidities in pp and p$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV

The ALICE collaboration
Eur.Phys.J.C 83 (2023) 661, 2023.

Abstract (data abstract)
CERN-LHC. A study of multiplicity and pseudorapidity distributions of inclusive photons measured in pp and p-Pb collisions at a center-of-mass energy per nucleon-nucleon collision of $\sqrt{s_\mathrm{NN}} = 5.02~\mathrm{TeV}$ using the ALICE detector in the forward pseudorapidity region $2.3<\eta_{\rm lab}<3.9$ is presented. Measurements in p-Pb collisions are reported for two beam configurations in which the directions of the proton and lead ion beam were reversed. The pseudorapidity distributions in p-Pb collisions are obtained for seven centrality classes which are defined based on different event activity estimators, i.e., the charged-particle multiplicity measured at midrapidity as well as the energy deposited in a calorimeter at beam rapidity. The inclusive photon multiplicity distributions for both pp and p-Pb collisions are described by double negative binomial distributions. The pseudorapidity distributions of inclusive photons are compared to those of charged particles at midrapidity in pp collisions and for different centrality classes in p-Pb collisions. The results are compared to predictions from various Monte Carlo event generators. None of the generators considered in this paper reproduces the inclusive photon multiplicity distributions in the reported multiplicity range. The pseudorapidity distributions are, however, better described by the same generators.

  • Figure 3(a)

    Data from Figure 3(a) (red solid squares)

    10.17182/hepdata.141495.v1/t1

    Inclusive photon multiplicity distribution measured within $2.3<\eta_{\rm lab}<3.9$ in pp collisions at $\sqrt{s} = 5020~\mathrm{GeV}$.

  • Figure 3(b)

    Data from Figure 3(b) (blue solid circles)

    10.17182/hepdata.141495.v1/t2

    Inclusive photon multiplicity distribution measured within $2.3<\eta_{\rm lab}<3.9$ in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5020~\mathrm{GeV}$.

  • Figure 3(c)

    Data from Figure 3(c) (blue open circles)

    10.17182/hepdata.141495.v1/t3

    Inclusive photon multiplicity distribution measured within $2.3<\eta_{\rm lab}<3.9$ in Pb-p collisions at $\sqrt{s_\mathrm{NN}} = 5020~\mathrm{GeV}$.

  • Figure 5(a)

    Data from Figure 5(a) (red solid squares)

    10.17182/hepdata.141495.v1/t4

    Pseudorapidity distribution of inclusive photons measured within $2.3<\eta_{\rm lab}<3.9$ in pp collisions at $\sqrt{s} = 5020~\mathrm{GeV}$.

  • Figure 5(b)

    Data from Figure 5(b) (blue solid circles)

    10.17182/hepdata.141495.v1/t5

    Pseudorapidity distribution of inclusive photons measured within $2.3<\eta_{\rm lab}<3.9$ in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5020~\mathrm{GeV}$.

  • Figure 5(c)

    Data from Figure 5(c) (blue open circles)

    10.17182/hepdata.141495.v1/t6

    Pseudorapidity distribution of inclusive photons measured within $2.3<\eta_{\rm lab}<3.9$ in Pb-p collisions at $\sqrt{s_\mathrm{NN}} = 5020~\mathrm{GeV}$.

  • Figure 6(a)

    Data from Figure 6(a)

    10.17182/hepdata.141495.v1/t7

    Pseudorapidity distribution of inclusive photons measured within $2.3<\eta_{\rm lab}<3.9$ in pp collisions at various LHC energies.

  • Figure 6(b)

    Data from Figure 6(b)

    10.17182/hepdata.141495.v1/t8

    $\langle N_{\rm \gamma} \rangle$ measured within $2.3<\eta_{\rm lab}<3.9$ as a function of collision energy in pp collisions.

  • Figure 8(top panel)

    Data from Figure 8 (top panel)

    10.17182/hepdata.141495.v1/t9

    Centrality-dependent pseudorapidity distribution of inclusive photons measured within $2.3<\eta_{\rm lab}<3.9$ in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5020~\mathrm{GeV}$ (Centrality estimator -...

  • Figure 8(bottom panel)

    Data from Figure 8 (bottom panel)

    10.17182/hepdata.141495.v1/t10

    Centrality-dependent pseudorapidity distribution of inclusive photons measured within $2.3<\eta_{\rm lab}<3.9$ in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5020~\mathrm{GeV}$ (Centrality estimator -...

  • Figure 11(a) (CL1)

    Data from Figure 11(a) (CL1) (black solid circles)

    10.17182/hepdata.141495.v1/t11

    $\langle N_{\rm \gamma} \rangle$ measured within $2.3<\eta_{\rm lab}<3.9$ as a function of $\langle N_{\rm part} \rangle$ for CL1 centrality estimator...

  • Figure 11(a) (ZNAHighpT)

    Data from Figure 11(a) (ZNAHighpT) (green solid squares)

    10.17182/hepdata.141495.v1/t12

    $\langle N_{\rm \gamma} \rangle$ measured within $2.3<\eta_{\rm lab}<3.9$ as a function of $\langle N_{\rm part} \rangle$ for ZNA (high-$p_{\rm T}$)...

  • Figure 11(a) (ZNAPbSide)

    Data from Figure 11(a) (ZNAPbSide) (orange solid crosses)

    10.17182/hepdata.141495.v1/t13

    $\langle N_{\rm \gamma} \rangle$ measured within $2.3<\eta_{\rm lab}<3.9$ as a function of $\langle N_{\rm part} \rangle$ for ZNA (Pb-side) centrality...

  • Figure 11(b) (CL1)

    Data from Figure 11(b) (CL1) (black solid circles)

    10.17182/hepdata.141495.v1/t14

    Values of $\langle N_{\rm \gamma} \rangle$/$\langle N_{\rm part} \rangle$ as a function of $\langle N_{\rm part} \rangle$ for CL1 centrality...

  • Figure 11(b) (ZNAHighpT)

    Data from Figure 11(b) (ZNAHighpT) (green solid squares)

    10.17182/hepdata.141495.v1/t15

    Values of $\langle N_{\rm \gamma} \rangle$/$\langle N_{\rm part} \rangle$ as a function of $\langle N_{\rm part} \rangle$ for ZNA (high-$p_{\rm...

  • Figure 11(b) (ZNAPbSide)

    Data from Figure 11(b) (ZNAPbSide) (orange solid crosses)

    10.17182/hepdata.141495.v1/t16

    Values of $\langle N_{\rm \gamma} \rangle$/$\langle N_{\rm part} \rangle$ as a function of $\langle N_{\rm part} \rangle$ for ZNA (Pb-side)...

  • Figure 11(c) (CL1)

    Data from Figure 11(c) (CL1) (black solid circles)

    10.17182/hepdata.141495.v1/t17

    Values of $\langle N_{\rm \gamma} \rangle$/$\langle N_{\rm part} \rangle$ as a function of $\langle N_{\rm \gamma} \rangle$ for CL1 centrality...

  • Figure 11(c) (ZNAHighpT)

    Data from Figure 11(c) (ZNAHighpT) (green solid squares)

    10.17182/hepdata.141495.v1/t18

    Values of $\langle N_{\rm \gamma} \rangle$/$\langle N_{\rm part} \rangle$ as a function of $\langle N_{\rm \gamma} \rangle$ for ZNA (high-$p_{\rm...

  • Figure 11(c) (ZNAPbSide)

    Data from Figure 11(c) (ZNAPbSide) (orange solid crosses)

    10.17182/hepdata.141495.v1/t19

    Values of $\langle N_{\rm \gamma} \rangle$/$\langle N_{\rm part} \rangle$ as a function of $\langle N_{\rm \gamma} \rangle$ for ZNA (Pb-side)...

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